ML19319C052
| ML19319C052 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/29/1976 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19319C048 | List: |
| References | |
| NUDOCS 8001300790 | |
| Download: ML19319C052 (1) | |
Text
f ENCLOSURE e<
O "OnIT0atno Or ExeLOSIvE rilxTuaes IN THE GASEOUS RADWASTE TREATMENT SYSTE!i TOLEDO EDISON C0tiPANY - DAVIS BESSE, UNIT 1 DOCKET 1i0. 50-346 RADIOACTIVE EFFLUENTS GAS ANALYZERS LIMITING CONDITION FOR OPERATION 2.4.2.6 Primary waste gas holduo system components shall not contain explosive gas mixtures.
ADPLICABILITY: ALL MODES ACTION:
a.
For systems designed to withstand a hydrogen explosion, the gas monitor shall alarm, both locally and in the control room, at a set point of 4% by volume of hydrogen or oxygen.
If the hydrogen or oxygen concentration reaches the set point, action shall be taken to reduce the concentration below 4% by volume of hydrogen or oxygen within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.
If the gas monitor or alarm is in-operable, gas samples shall be taken and analyzed each 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> during offgas system operation, and the instrument shall be made operable within two weeks or the primary waste gas holdup system shall not be operated.
b.
For systems not designed to withstand a hydrogen explosion, the automatic control features to prevent potentially-explosive gas mixtures in the system components, shall be initiated by either of two independent gas monitors and both shall alarm locally and in the control room at the set points of 2% and 4% by volume of hydrogen and/or oxygen; or if the automatic control features fail to be actuated when either set point is reached, immediate action shall be taken to reduce the hydrogen or oxygen concentration to safe levels.
If either gas monitor or any alarm is inoperable, l
gas samples shall be taken and analyzed each 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> during offgas system operation; and if the instrument can not be made operable within two weeks the primary waste gas holdup system shall not be operated.
If the automatic control features to prevent potentially-explosive gas mixtures are inoperable and cannot be made operable within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, the primary waste gas holdup system shall not be operated.
1 f'PVEILLANCE REOUIREMENTS I
2J.2.6-1 All gas analyzers shall have daily sensor checks, monthly func-M6641 tests, and auarterly calibration by an approorf ate gas mixture Wrc e.
Any automatic control features to prevent potentially-explosive
- f etures shall have a monthly functional test.
8001300270